Can you not do a roof mount? Trees are enough of a hurdle w/o having to deal with the signal reduction of the attic as well. Keep in mind that metallic building materials will reflect signal.
What sort of trees to the north? Tall poplars or pines with a high canopy might mean you'd be better off with an install closer to the ground. A magnolia would be natures version of a firewall, blocking virtually everything from top to bottom. What you want to see is as much horizon as possible.
You'll want a UHF/VHF antenna for sure, (at least VHF-Hi) as you have some VHF channels there. Popular selling (re: trendy) antennas are often UHF only, so be sure to verify what you're getting when you purchase.
I'd be inclined to get at least a medium antenna, as they are more directional than smaller ones. That would likely be a good tool for the job, aimed at 43 degrees, or NNE. It won't exactly help you tune channels from other directions though. I think I'd go with at least a Winegard 7696p, maybe even bigger. It would tune all of the channels you listed. The big factor is the trees to your north.
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